# How do i verify the following trig identity? (tan^2x + 1)(cos^2x - 1) = -tan^2x

##### 1 Answer

May 25, 2018

See below.

#### Explanation:

To find cos^2x -1, we can use the identity

May 25, 2018

See below.

To find cos^2x -1, we can use the identity